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Trama troglodytes

Artichoke tuber aphid

Identification & Distribution 

Identification & Distribution:

Trama troglodytes adult apterae are white, yellowish-white or grey depending on age. Their antennae are about 0.5-0.6 times the body length. The most distinctive character of this aphid is the elongate hind tarsus which is at least as long as the hind tibia (see pictures below). Their cauda is semi-circular. The body length of Trama troglodytes aptera is 2.5-3.9 mm.

 

The terminal process of the aptera antenna is shorter than the base of the sixth antennal segment (see first micrograph below). The Trama troglodytes alate has dark dorsal sclerites and marginal sclerite. The antenna of the alate has 0-4 secondary rhinaria on segment III, 0-4 on segment IV and 0-6 on segment V.

 

The artichoke tuber aphid lives on the roots of many Asteraceae, especially Achillea, Artemisia, Cirsium and Sonchus. They are invariably attended by ants. These aphids mainly overwinter as parthenogenetic forms, but oviparae and blind wingless males have been found in southern England. Trama troglodytes is found in Europe, west Siberia, Central Asia and Japan.

Acknowledgements

We especially thank Alan Outen (Bedfordshire Invertebrate Group ) and Bridget O'Dell for their kind assistance, and permission to sample.

We have made provisional identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994)  and Blackman & Eastop (2006)  supplemented with Blackman (1974) , Stroyan (1977) , Stroyan (1984) , Blackman & Eastop (1984) , Heie (1980-1995) , Dixon & Thieme (2007)  and Blackman (2010) . We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure  provided by Blackman & Eastop (2006).

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